Pump



WITNESSES n. s. nn. MITCHELL.'

PUMP. APPLICATFON FILED JULY B. 1916. RENEWED FEB. 28. 1922. Lzm. Patented oct. 17, 11922.

3 SHEETS-SHEET l.

R. S. M. MITCHELL.

PUMP. APPLlcAloN 'man :uLY 191s. RENEwED FEB. 2s. 19.22. l%2983l Panama oct. 17911922.,

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Pun/IP.

APPLICATION FILED JULY 9| 1916. RENEWED FEB- 281 1922. LQSQQQEJL c l Patented 00L. )17, 31922.

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Tq.. @Figi Patented @et l?, 1.92.2.

Ubllfhll STATES RICHARD S. M.

MITCHELL, OF PORT JEFFERSON, NEW YORK.

PUMP.

Application led July 8, 1916, Serial No. 108,128.

7 o all w 7mm it may @office/rfa Be it known that I, RICHARD S. M. MITCH- ELL, a citizen of the United States, and a resident of Port Jefferson, Suffolk County, Long Island, New York, have invented certain new and useful Improvements in Pumps, of which the following is a speciiication.

My invention relates to pumps. of that y class in which a piston travels in an annular piston chamber, and the invention aims to provide an improved pump of this class in which the piston shall during port-ions of its movement operate between spaced abutments as in a reciprocating pump and during portions of its movement shall operate with the annular passage interrupted or closed by an abutment only at one point, the pumped fluid being discharged through a single outlet at certain periods and through a plurality of outlets at other periods, and the pump having its suction through a single inlet at certain periods and through a plurality of inlets through other periods, the construction, form and arrangement of parts being such as to insure at a deiinite pump speed the continuous passage of :fluid through one or anotherv portion of the annular passage, resulting in a steady and relatively great discharge.

I accomplish these results by means of a piston rotatable in an annular chamber intercepted at intervals by valves or abutments having, each, a plurality ol" passages therethrough at least one of which will present a continuity of the annular chamber when in fully opened position to permit the passage of the piston without interruption to the etliciency of the packing thereof.

My pump embodies the principle of the mechanical movement shown, and described in my application for Letters Patent of the United States filed by me on the 17th da); of June, 1915, Serial No. 34,768. of a valve having a passage therethrough forming sector of, or continuity of, an annular chamber.

The valves are operable at definite inoments and in definite degrees to serve port closures, as single conduits, as double conduits, and as abutments to divide the annular chamber at one point, and at a plurality of points to form a plurality of separate cylinders, and act individually at certain periods and cooperate at other periods.

A. further vfeature of my pump is that,

Renewed February 28, 1922. Serial No. 539,909.

while I provide check valves in the present structure, under certain conditions these check valves are entirely thrown out of action by the velocity of flow through the pump, and I may dispense with t-hese check valves in certain types of pumps.

My invention is fully described in the following specification, of which the accompanying drawings form a part, .in which like characters refer to like parts in each of the views, and `in which Fig. 1 is a side elevation of a pump em bodying my invention;

Fig. 2 is a vertical section therethrough, on the line 2-2 of Fig. 3;

Fig. 3 is a section taken on the line 3 3 of Fig. 2.; 1

Fig. 4 is a section taken on the line 4 4 of Fig. 1;

Fig. 5 is a fragmentary view of one side of a valve action control, also shown in Figs. i, 3 and 4.;

Fig. 6 is a diagrammatic view of the pump advanced from the position of the parts shown in Fig. 2; and

Figs. 7, 8, and 9, are similar views showing further advanced positions.

Referring to the drawings, 10 represents a casing shown as of two members joined on a central longitudinal vertical plane and provided with an annular passage or chant ber 11 illustrated as circular in crossssection, with inlet ports 12 and 13, controlled by check-valves 1li and 15, respectively, and with. discharge ports 16 and 17 controlled by check-valves 18 and 19, respectively.

The ports 12 and 17 are controlled by a valve 2O and the ports 13 and 16 by a valve 21, said.` valves being identical and intercepting the annular chamber 11 at diametri.- cally opposite points, and4 are shown as of the rotary type of cylindrical form the centers of which, in cross-sectional view, are slightly within the outer periphery of the annular chamber 11, although this is not imperative, but the peripheries of said valves for a purpose later explained, pass inward of the inner ,periphery of the annular' chamber 11, that is, the valves or abutments eX- tend beyond the walls l0f the passage in all directions transverse to the passage.

The valves or abutments 2() and 21 are each provided with a passage, 20a and 21a, respectively, of the exact configuration of the annular chamber 11 whereby, when in the position shown at the top of Figs. 2 and 3 for the valve 21, no interruption of the surface of the chamber occurs. The valve 20 is also provided with a passage 2Ob and the 'chamber 11, the

valve 21 with a passage 2lb the formation of which is arbitrary and which are for connecting the ports 17 and 16 with the annu; lar chamber /11 at desired periods.

Arranged centrallyl of the circle described by the chamber 11 is a shaft 22 having a carrier 23 thereon for a piston 24:v closely fittingV the chan'rb'el.' 11 within which itl rotates, and likewise 'fitting' the passages 20iL and 21'2L when pass'ng through .the saine and ina non-leaka`ble manner. The valves or abut# ments 2() and 21 arel each" formed with asltr opening from its passage, 2OEL or 21, regster with the slot of the ai'inulai' pistoivi pas# sage or chamber l1, and to"receivev the edge of the'carrier 23, as rshown ilillig; 3.

As shown in Figs; 3 and l, theI sha'li't 22` passes' through glands 25 for packings26 for the piston and carrierl interposed be'- tween sleeves 27 and the central portion of the casing 10, the -latter being' beveled a't' the contacting surfaces' adjacent the carrier 23 to permit the packings 26 to closely approach the'r :inner peri'pheryfof the annular glands being held iii-place by screws 29 or they equivalent. i

The valves 20 and 21 are provided with stems 30 and 31, respectively, passed outwardly through the vcasing',10 and provided, each, with a segment gear 32 enmeshe'd with a similar gear 33 carried byfa stub-'shaft' 34 mounted in a bracket 35 whichalso' supports the outer end of the respective valve stem.

The segment gears 33, Figs. e and 5, carry,

each, two rollers 36 and 37 adapted to bear,

away at 41 arranged upon opp'osite sides ofl the shaft 22, with the result that whenthe roller 36 is riding o'nthe inner surface ofthe disk 38 lthe roller 37 is held in the cut-away portion of the periphery of thedisk 39. Vhen the shoulder at the erid of thecuft# away portion of the disk 39 engages the roller 37 the latter is forced to the inneiI sui'- facc of the said. disk, the roller 3.6 then entering the cut-away portionof the disk 38 now in position for the .reception of said roller, and this traiis'p'osition ofthe rollers te and from the 4inner surfacesv of the' respective disks rocks theVv respective segment" gear 33 and this correspondingly rocks the respective gear and the respective valve stem is rocked and,vwith it, thevalve thereof;

The valves are', as willbe seen, rocked through-a definite are'of a circle; each, andy found' to be entirely satisfactory in actual use, but I do not limit myself thereto nor to any type of actuator as many forms thereof will suggest themselves for this particular pump or others based upon the principles thereof.

In order to ensure exact continuity of the passa'"ges20L and V21n with the annular chamber 11 I provide a clamp 4.2 on each of the valve stems 30 and 311, adjustable thereon, and I provide'a fixed bracketl having a screw 414 therein against which the respective clamp strikes when the valves 2O and 21 reach a' fully-opened position, the clamps forming parts of the respective segment gears 32, andfit will thus be seen that said gears may be set with precision so as to ensure the continuity referred to- In Fig. 2l I have shown the valve 2O in po; sition to' serve as an abutment, the fact that thel periphery thereof extends inwardly of the inner periphery of the chamber 11 as hereinbefore referred to ensuring a positive sea't of the valve upon the casing' 10 to prevent leakage, Figs'. 2 and 3, and in -vvhich positionsaid'valve presents the passage 20LL to the inlet port 12 and the passage' 20b to the discharge port 17, and the liquid pumped in at the former' must pass through the chamber 11 before it can reach the latter.

In this figure the valve 21 is shown in fully opened position, with respect to the annular chamber 11, and serving as a closure' for' the' ports 13 and 16, the' piston 24: being shown as passing through said valve, and said piston is thus drawing in liquid through the port 12 and discharging liquid in front of it through the port 17, this position presenting the perfect rotary pump principle inasmuch as there is and can be no leakage while the piston is passing throiigh the passage 211.

Byreference to Fig. 6 it will be seen that the valve 21 begins to close" the chamber 11 after the piston has passed through said valve, thereby opening the inlet port 13'to the said chamber, as well as the discharge port 16, but thevalve 20'is still serving as an abutment', with the result that the liquid is beingy drawn in'through'both inlet ports 12 and 13 and discharged 17, the discharge p'ort 16 cally closed. y

In 7 it will. be seen that the valve' 21 has closed the chamber lil. and the valve 20 is still in its abutment position, with theresult that the chamber 11' is divided into two separate cylinders suction occurring through the p'ort 13 and discharge through the po'rt 17. This condition still obtains with afurther piston movement' to lthe position shown in' Fig. 8,y but the valve 2() is now about ready tomove to bring the passage'20Et into positionto allow the'piston to pass.; In' beur of' these pstions', after a through the p'ortV being still practivil minimum pump speed has been attained to produce a su'liicient velocity of the liquid through the pump, a column oi liquid Will flow in through the port 12, through the lett side ot the chamber 11, and discharge through the port 16, and this Will occur at both sides of the chamber alternately When the valves are in the abutment serving positions and tlie piston upon the respective sides of the pump, and We thus have a reciprocating pump by reason of the fact that two separate cylinders and corresponding ports are alternately brought into action, although, as stated, a rotary action also occurs upon the side of the pump not occupied by the piston. above a minimum pump speed because ot the velocity imparted to the Coluiun ot" Water on such side.

ln Fig. 9 l have shown the valve 20 just opening to permit piston passage therethrough, the liquid now being drawn in through the port 13 and part thereotl discharged through the port 17, the balance of the liquid coming through the port 13 passing through the valve 20 and out through the port 16, the check-valves 14L preventing the flow of water outwardly through the port 12, and We thus have one inlet in action and two outlets. Above a minimum pump speed the liquid passing to and out ot the discharge port 16, in this position of the parts, will cause a suction which will draw liquid through the port 12 and correspondingly increase the amount discharged through the port 16.

rlhis action produces a steady discharge l`ro1n the pump even at low pump speeds, and at high pump speeds the velocity of :flow on the side ot the pump unoccupied by the piston overcomes the check-valves 'la and. 15 alternately and. correspondingly increases the discharge.

lrlhile l have shown an entirely satisfactory structure, based upon pumps in actual use, l do not desire to limit myself to the details thereof, other than such as are set iliorth in the appended claims, and l reserve the right to make any desired changes which come Within the spirit ot the inven- J lilOll.

Having fully fflescribed my invention, what l `m new, nd desire to secure by Letters Patent, is :w

1. inimp. comprising a casing 'formed with an annular passage ot uniform circular cross-section and having a continuous slot opening inwardly through the Wall of the passage and. inlet and outlet ports leading to said passage, a rotary piston carrier eX- tending into and by Which said slot is closed, a piston in said passage connected to move with said carrier, a plurality of rotary abutments extending across said passage and controlling said ports, said abutments being mounted with their axes parallel with the axis ot rotation of the carrier in abutment chambers intersecting said annular passage and each abutment extending beyond said passage in all directions transverse to said passage and each being formed with a passage of the same circular cross-section and the same longitudinal curvature as said annular passage and positioned to form a part of the annular passage when the abutment is turned to bring its passage into register With the annular passage and having a slot opening from its passage to register With said continuous slot, and means for turning said abutments into and out of position to permit the passage ot the piston and for controlling said ports.

2. A pump, comprising a casing 'formed with an. annulaipassage et uniform crosssectiou and the: cross-sectional contour of which is continuously curved and having a continuous slot opening inward through the'wall oli' the passage, a rotary piston carrier extending into and by which said slot is closed, a piston in said passage connected to move with said carrier, a plurality of rotary abutments extending across said passage and mounted With their axes parallel with the axis of rotation of the carrier in abutment chambers intersecting said an nular passage, the casing being formed with inlet and outlet ports leading to said abutment chambers, each abutment extending beyond said annular passage yin all directions transverse to said passage and. each being formed with a passage shaped to form a part olf said annular passage When the abutment turned to bring its passage into register with the annular passage and having a slot opening from its passage to register with said continuous slot, and means for turning said abutments into and out of position to permit the passage et the piston and for controlling said ports.

A pump, comprising a casing termed with an annular passage of uniform cross section and the cross-sectional contour of which is continuously curved and having a continuous slot opening inward through the Wall of the passage, a rota-ry piston carrier extending into and by which said slot is closed, a piston in said passage connected to move with said carrier, a plurality of rotary abutments extending across said passage and mounted With their axes parallel With the aXis of rotation of the carrier in abutment chambers intersecting said annular passage, the casing being formed with inlet and outlet ports leading to said abutment chambers, each abutment extending beyond said annular passage inv all directions trans` verse to said passage and each being formed With a plurality of passages, one of Which is adapted to serve as a piston passage and is shaped to form a part of said annular passage When the abutment is turned to bring p secti'on'and the cross-sectional contour oi; 10"

- out of position to permit the passage of the piston and for controlling said ports,

Il; A pump, comrbrising a. casing formed with an annular passage oit uniform crosswhich is lcontinuously curved and having a continuous slot opening inward through the wall ot' the passage.l a rotary piston carrier extending into and by which said slotr is closed, a piston in said passage connected to move with said carrier, a rotary abutment extending across said passage, said abutment being mounted 'with its axis parallel with the axis of rotation of the Carrier in an abutment chamber intersecting said annular passage, the casing being formed with inlet and outlet ports leading` tosaid abutment chamber', and said abutment extending beyond said annular passage 1n all directions transverse to said ]Q)assage and being" formed with a passage shaped to form a part-"-of'sal'd annular passage when the abutment is turned to bring its passage into register with the annular passage and having a slot opening from its passage tov register With said continuous slot, and means for turni-ng said abutment into and out ol position to permit the passage of the 'piston and for controllingvsaid ports and into position to close said annular passage.

5; A pump, comprising a easing formed with an annular passage or uniform cross` section andthe cross-sectional contour of l which is continuously curved and having a continuous slot opening inward through the Wall of the passage and inlet and outlet ports leading` to said passage, a rotary piston cairierr extending into and by Which said slet is closed, a piston in said passage connected to move with said carrier, a plurality of rotary abutments extending across said passage, said abutments being mounted With their axes'parallel With the axis of rotation of the carrierV in abutment chambers intersecting said annular passa-ge andleach abutment extending beyondV saidpassage in all directions transverse to said passage and each being formed with a passage shaped to forni-1a partof said annular passage when the abutment is turned to bring'its passage inte register with the annular passage and havingv a slot opening from its passa-ge to register with said continuous slot, and means for ti'irning said abutments into andr out ol position to permit the passage of the piston and into position to close said annular pas sage. Y y

6. A pump, comprising a casing having an annular chamber, an inlet and an outlet port at one side thereof, andan inlet and an outlet port at the other side thereof, a valve intercepting said chamber in the position of and controlling each set of ports, and provided With a plurality of passages therethrough, and means for actuating said valves alternately to carry each into port closure position, into position to open either respective port, into position to open both respective ports, and into position to serve an an abutment for said chamber.

7. A pump, comprising a casing having an annular chamber therein and inlet and outlet ports at opposite sides thereof, a rotary valve intercepting said chamber in the position or' and controlling each set of ports, a stem on each valve, a gear on each stem, a supplemental gear enmeshed With each of said gears, a pair of parallel disks having recesses eut in their peripheries at opposite RICHARD S. M. MITCHELL. 

